Instructions: http://stackoverflow.com/questions/223657/svn-blame-in-eclip...
Screenshot: http://wiki.c2b2.columbia.edu/informatics/index.php/Eclipse#...
This will allow you to see commit messages in the code editor on a line-by-line basis. To know if a line of code had a bug in it, you would need to make sure that that sort of information is written into commit messages. Here we use a "Fixes issue #12312" trigger in post commit hook, so that the commit, the code change and the Trac ticket are all linked.